Analog Devices Inc./Maxim Integrated MAX6854UK16D3+T

Overview

The MAX6854UK16D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, providing voltage monitoring, manual reset input (MR), and fixed 150ms minimum reset timeout. It asserts an active-low open-drain RESET output when VCC drops below 1.575V (factory-trimmed threshold), during MR assertion, or after power-up/brownout - with guaranteed reset validity down to VCC = +1.1V. It targets ultra-low-power portable medical and consumer devices such as glucose monitors and MP3 players.

For engineers reviewing the MAX6854UK16D3+T datasheet, MAX6854UK16D3+T pinout, MAX6854UK16D3+T application, or MAX6854UK16D3+T equivalent, key selection criteria include its 170nA typical supply current, 1.575V reset threshold, 150ms reset timeout (D3 option), open-drain RESET output, and immunity to short VCC transients - all critical for battery-powered system reliability and low-quiescent design.

Technical Context

This device integrates a precision voltage comparator with 2.5% threshold accuracy, a monolithic reset timeout timer, and a CMOS-compatible manual reset input with 10kΩ internal pullup. Its open-drain RESET output requires an external pullup and supports logic-level interfacing across supply domains up to 5.5V.

The MAX6854UK16D3+T lacks watchdog timer (WDI) and CT (timeout select) pins - confirming it belongs to the base MAX6854 variant group with fixed D3 timeout and no programmable features. It operates across –40°C to +85°C and guarantees functional reset assertion down to VCC = 1.1V, enabling robust brownout detection in deep-sleep systems.

Key Specifications

Pinout & Package

Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microprocessor supervisory applications.

Compared with the MAX6854UK16D3+T, the TPS3836K33DBVR offers higher drive strength but consumes 20× more current, while the MAX6361KA16D3+T matches threshold and timeout but sacrifices open-drain flexibility and adds 7× ICC - making the MAX6854UK16D3+T optimal for ultra-low-power, multi-rail, or noise-sensitive designs.

Availability

MAX6854UK16D3+T is available at Aetrix Electronics and suitable for glucose monitors, patient monitors, and smart pagers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX6854UK16D3+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for power, sensing, and interface applications in industrial, medical, and portable electronics.

The MAX6854UK16D3+T belongs to Maxim's nanopower µP supervisory family, engineered specifically for battery-critical applications where sub-µA quiescent current, guaranteed low-VCC reset validity, and minimal external components are mandatory.

FAQ

What is the exact reset threshold voltage of the MAX6854UK16D3+T?

The MAX6854UK16D3+T has a factory-trimmed reset threshold voltage of +1.575V, with ±2.5% tolerance over temperature (–40°C to +85°C). This value is confirmed by the "16" suffix in the part number per Maxim's Threshold Suffix Guide (Table 2), and is validated in the Electrical Characteristics table under VTH parameter. The MAX6854UK16D3+T maintains this threshold stability across its full operating range.

Does the MAX6854UK16D3+T include a watchdog timer function?

No, the MAX6854UK16D3+T does not include a watchdog timer. Its part number contains no watchdog suffix (e.g., "S" or "L"), and the device belongs to the MAX6854 base variant group, which is explicitly defined in the Selector Guide as having MR but no WDI pin. The MAX6854UK16D3+T provides only voltage monitoring and manual reset - no watchdog functionality is present or supported.

What is the reset timeout period for the MAX6854UK16D3+T, and is it adjustable?

The MAX6854UK16D3+T has a fixed minimum reset timeout period of 150ms, indicated by the "D3" suffix per Table 4. It is not adjustable - unlike MAX6861–MAX6863 variants, the MAX6854UK16D3+T lacks a CT pin and offers no pin-selectable or programmable timeout options. The 150ms duration is guaranteed across temperature and supply voltage, ensuring reliable µP initialization timing.

What type of RESET output does the MAX6854UK16D3+T provide?

The MAX6854UK16D3+T provides an active-low open-drain RESET output (Pin 1), as confirmed by the MAX6854/MAX6856 Pin Description table and Selector Guide. This requires an external pullup resistor to the target logic rail. It does not offer push-pull or active-high variants - those are assigned to other members of the family (e.g., MAX6855 for active-high push-pull).

Can the MAX6854UK16D3+T operate reliably below 1.8V supply voltage?

Yes, the MAX6854UK16D3+T is fully specified down to VCC = +1.2V and guarantees valid reset assertion down to +1.1V, as stated in Absolute Maximum Ratings and Electrical Characteristics. Its 170nA typical supply current and 1.575V threshold make it uniquely suited for sub-1.8V systems - including single-cell alkaline or LiFePO₄ applications - where conventional supervisors fail to assert reset.